Functions

• Functions are used in predicates
• Eg, test whether the substring in the current element's content,

  starting at character #5 and having two characters,

  can be converted to the number 25:

    <xsl:if test="number(substring(.,5,2))=25">

• There are around 35 functions, including
  • conversions (eg, number())
  • string manipulation (eg, concat())
  • arithemetic (eg, floor(), sum())
  • getting node and identifier names (eg, lang())
  • boolean (eg, not())
  • context information (eg, last())